Year annual % 1962 2.322530455505742 1963 2.3410232723279236 1964 2.8482345267242835 1965 2.873505006493552 1966 3.5744260351365256 1967 2.329682164014855 1968 2.2907665166921447 1969 3.3383671379969257 1970 3.7094041172531362 1971 4.664180022913939 1972 6.413089166541425 1973 13.387368046760258 1974 20.258397841619825 1975 9.618618619938331 1976 9.734643373870945 1977 10.256483955127422 1978 8.417213279000578 1979 13.004685824598766 1980 13.898534825435256 1981 9.29050168643547 1982 7.90744147762004 1983 8.649172498779478 1984 9.546317183757544 1985 7.193785444529425 1986 6.569952894922309 1987 8.842020422323088 1988 9.060963477006354 1989 8.593756575454691 1990 10.652751293411072 1991 15.132390367979667 1992 11.915633250761104 1993 11.605429309027535 1994 15.339598343417975 1995 10.679005567444506 1996 8.798385813484344 1997 7.281112053145662 1998 6.931402668889049 1999 6.731820944220871 2000 7.207762797170972 2001 6.012792433817381 2002 4.830917874396135 2003 5.53933744651502 2004 6.951992680864663 2005 6.479202402556524 2006 8.343721126029521 2007 7.063421716942344 2008 9.407491822381402 2009 2.8806517685043858 2010 6.9233633781208965 2011 7.636574135158966 2012 4.7919228446595525 2013 3.576711128147913 2014 3.331756917033431 2015 2.7583920627998566 2016 2.7071912966317484 2017 3.824972328099193 2018 3.5975738926426857 2019 3.061879454583277 2020 2.573040445058993 2021 5.772426336908978 2022 8.241191953236054 2023 4.620073429263293